I was wondering if anyone has made any progress on this, or figured out what is going on? I am getting nearly the same error message when either logging out or shutting own. I've attached the relevant section of /var/log/kern.log.

Interestingly, I also have MacbookPro10,1. I never encountered this issue until I just recently switched from using my discrete graphics chip (with either propietary nVidia or the nouveau driver), to using the integrated graphics card. That's when this message started appearing.

Prem Anand, this bug was reported a while ago and there hasn't been any activity in it recently. We were wondering if this is still an issue? If so, could you please test for this with the latest development release of Ubuntu? ISO images are available from http://cdimage.ubuntu.com/daily-live/current/ .

If it remains an issue, could you please run the following command in the development release from a Terminal (Applications->Accessories->Terminal), as it will automatically gather and attach updated debug information to this report:

apport-collect -p linux REPLACE-WITH-BUG-NUMBER

If reproducible, could you also please test the latest upstream kernel available (not the daily folder) following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this bug is fixed in the mainline kernel, please add the following tags:
kernel-fixed-upstream
kernel-fixed-upstream-VERSION-NUMBER

where VERSION-NUMBER is the version number of the kernel you tested. For example:
kernel-fixed-upstream-v3.13-rc6

This can be done by clicking on the yellow circle with a black pencil icon next to the word Tags located at the bottom of the bug description. As well, please remove the tag:
needs-upstream-testing

If the mainline kernel does not fix this bug, please add the following tags:
kernel-bug-exists-upstream
kernel-bug-exists-upstream-VERSION-NUMBER

As well, please remove the tag:
needs-upstream-testing

Once testing of the upstream kernel is complete, please mark this bug's Status as Confirmed. Please let us know your results. Thank you for your understanding.

I dont see this crash with 3.13.0-4-generic (14.04) and 3.13.0-6-generic (13.10) kernel version. Both logout/login and supend/resume works perfectly fine.

Though I do have problems now with switching off the dedicated video card. Though the integrated card powers the display, still on switching off the dedicated card, the screen turn blank. But thats a different issue

Prem Anand, this bug report is being closed https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1205329/comments/10 due to your last comment regarding this being fixed with an update. For future reference you can manage the status of your own bugs by clicking on the current status in the yellow line and then choosing a new status in the revealed drop down box. You can learn more about bug statuses at https://wiki.ubuntu.com/Bugs/Status. Thank you again for taking the time to report this bug and helping to make Ubuntu better. Please submit any future bugs you may find.